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Sounds like more of the pieces of React/Flux are being opensourced. :-)

Interesting to see references to TypeScript. Is it prevalent at FB?

This isn't used internally by Facebook at this point. The author mentioned this after your post. https://news.ycombinator.com/item?id=8108741

Thanks!

But even if it is not being used yet - do we know if Facebook uses Typescript (or some extension of it)?

To clarify your point, immutable isn't in production at FB yet; we don't know about TypeScript.

If you want "pieces" with similar functions to what React has then there is the very modular Mercury too: https://github.com/Raynos/mercury